Common ravens and number and type of linear rights-of-way

We counted common ravens (Corvus corax) during 1990 and 1991 in the Mojave Desert, California, to examine hypotheses relating to number and type of linear rights-of-way. First, we hypothesized that raven numbers would increase with increasing road traffic volume and traffic speed. Second, we hypothesized that raven numbers would show a positive relationship with increasing number of linear rights-of-way which ran in parallel. Our data did not support the first hypothesis but did support the second.